| 0,0 → 1,104 |
|---|
| #include "SDL/SDL_image.h" |
| #include "SDL/SDL_opengl.h" |
| |
| #include <iostream> |
| |
| using namespace std; |
| |
| #include "texture.hpp" |
| |
| Texture::Texture(string filename) |
| { |
| loaded = false; |
| |
| GLenum textureFormat = GL_RGB; |
| |
| SDL_Surface *surface = IMG_Load(filename.c_str()); |
| if (surface) |
| { |
| GLint noOfColours = surface->format->BytesPerPixel; |
| if (noOfColours == 4) |
| { |
| if (surface->format->Rmask == 0x000000ff) |
| { |
| textureFormat = GL_RGBA; |
| } |
| else |
| { |
| textureFormat = GL_BGRA; |
| } |
| } |
| else if (noOfColours == 3) |
| { |
| if (surface->format->Rmask == 0x000000ff) |
| { |
| textureFormat = GL_RGB; |
| } |
| else |
| { |
| textureFormat = GL_BGR; |
| } |
| } |
| else |
| { |
| // Big Problem! |
| } |
| |
| glGenTextures(1, &texture); |
| |
| glBindTexture(GL_TEXTURE_2D, texture); |
| |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| |
| width = surface->w; |
| height = surface->h; |
| halfWidth = width * 0.5; |
| halfHeight = height * 0.5; |
| |
| glTexImage2D(GL_TEXTURE_2D, 0, noOfColours, width, height, 0, textureFormat, GL_UNSIGNED_BYTE, surface->pixels); |
| |
| SDL_FreeSurface(surface); |
| |
| loaded = true; |
| } |
| } |
| |
| Texture::~Texture() |
| { |
| if (loaded) |
| { |
| glDeleteTextures(1, &texture); |
| } |
| } |
| |
| void Texture::draw(int x, int y) |
| { |
| if (loaded) |
| { |
| glBindTexture(GL_TEXTURE_2D, texture); |
| |
| int x1 = x - halfWidth; |
| int x2 = x + halfWidth; |
| int y1 = y - halfHeight; |
| int y2 = y + halfHeight; |
| |
| glBegin(GL_QUADS); |
| //Bottom-left vertex (corner) |
| glTexCoord2i(0, 0); |
| glVertex3f(x1, y2, 0.0f); |
| |
| //Bottom-right vertex (corner) |
| glTexCoord2i(1, 0); |
| glVertex3f(x2, y2, 0.f); |
| |
| //Top-right vertex (corner) |
| glTexCoord2i(1, 1); |
| glVertex3f(x2, y1, 0.f); |
| |
| //Top-left vertex (corner) |
| glTexCoord2i(0, 1); |
| glVertex3f(x1, y1, 0.f); |
| glEnd(); |
| } |
| } |